How oil drain pan sizing works
Quarts-to-gallons, job count, and legal disposal.
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Oil drain pan capacity calculator
Enter sump fill in quarts and how many oil changes before emptying. Get required gallons ((qt÷4)×jobs), then an 8 / 15 / 20 gal class — or NO_MATCH. Leave headroom; dispose waste oil legally.
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Result
Required gallons = (sump_qt ÷ 4) × jobs. Classes: 8 · 15 · 20 gallons. Above 20 gal required → NO_MATCH. Leave headroom; dispose waste oil legally; confirm live published capacity.
From measurement to decision
Open the full calculator
Same tool with room for examples.
8 vs 15 vs 20 gal classes
When each class fits — and when none do.
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